salisbury



(ModeL) G. P. SALISBURY.

METHOD OF CLOSING BLANK CARTRIDGES. No. 260,326. Patented June 27, 1882.

II 451. ai

p Uni/6 272 Q QZMZ UNITED STATES PATENT OFFICE.

GEORGE P. SALISBURY, OF NEW HAVEN, CONNECTICUT, ASSIGNOB TO THEWINCHESTER REPEATING ARMS COMPANY, OF SAME PLACE.

METHOD QF CLOSING BLANK CARTRIDGES.

SPECIFICATION forming part of Letters Patent No. 260,326, dated June27,1882. Application filed March 13, 1882. (Model.)

To all whom it may concern:

Be it known that I, GEORGE P. SALISBURY,

of New Haven, in the county of New Haven lowing, when taken inconnection with accompanying drawings and the letters of referencemarked thereon, tube a full, clear, and exact description of the same,and which said drawiugsconstitute part of this specification, andrepresent, in-

Figure 1, a perspective view showing previous construct-ions; Fig. 2, aperspective view showing my improvement; Fig. 3, a vertical section ofthe same on line at as; Fig. 4, a vertical section on line 2 2,- Fig. 5,a vertical sec tion, and Fig. 6 a face view, of the die.

This invention relates to an improvement in l the manufacture ofcartridges, with special referenceto blank cartridges, or such as areprovided with powder only.

Fig. 1 illustrates the usual method of making these cartridges The shellis drawn of the usual cylindrical shape throughout, and into. it theproper quantity of powder is introduced. Then onto that powder a wad, a,is

placed. Then, by a cup-shaped or concave die, the mouth of the shell iscontracted over the wad.

In the use of this concave die, which draws theedge of the shell inwardequallyaround tho circumferenceot' the shell, great force is required inorder to properly contract the metal. The fulminate being in the shell,and the dies working rapidly, the force produces a blowlike effect uponthe cartridge-head, snfiicient to often produce explosion, so that greatcare is required to be exercised in the manufacture of these cartridges.7

The object of my invention is to overcom this difficulty; and itconsists in first turning the edge of the shell inward at difierentpoints, and later turning in the parts intermediate between the saidpoints, whereby so little force is required that the liability toexplosion is avoided. The shells are of the same construc-' tion,primedand loaded, and fitted with the wad in the usual manner. I

Instead of the usual concave die,Iconstruct adio as seen in Figs. 5 and6, which has a the same usnal' concave shape, but inthe die is broughtdown'upon the open end of the surface 'ofthe die I cut radial cavitiesd. This shell in the usual manner. That part of the die between thecavities d strikes the edge and without contactatthe cavities. Hence thepart of the cartridge-shell turned in is only that between thecaviticsthat is to say ,th rst force of the die is at difl'erent pointse around the mouth of the shell, and bends the shell inward at thosepoints, the cavities permitting the part of the shell between theturned-in points 0 to bend into rib-like shapef, and thus take up thesurplus metal, which in the old method was required to be contractedinto the edge of the shell.

The bottom of the cavities should be made slightly concave, so as toalso turn the ribs inward, as seen in Fig. 2; but the action of the dieupon the parts between the ribs will naturally tend to turn those ribsinward. Hence it is not essential that the bottom of the ca'vityin thedies should take a bearing upon the outer edge of the ribs. Because ofthe die taking its bearing at different points and permitting the ribsto form between those points, the efl'ect upon the shell is very muchthe same as if the shell were slit longitudinally on the line of theribs. There is no contraction of the metal, as in the previous method.Hence very little force is required to close the mouth of the shell overthe wad, so little that explosion by the force of such closing isavoided.

I do not wish to be understood as limiting my invention to performingthe closing of shells bydies such as I havedescribed,neither to theforming of narrow ribs with broad spaces between, as this order may bereversed, the first eifect being to turn in narrow spaces and leavebroad spaces between-thatis to say,

such, for instance, as producing ribs upon the inside'instead of uponthe outside-it only being essential to my invention that the edge of theshell shall be first turned inward at different points, and later theparts intermediate between said points.

,I claim- 4 The method herein described of closing the mouth ofcartridge-shells, consisting in first turning the shell inward'atdifferent points of its circumference, and later turning in the partsintermediatebetween said points, sub ,stantially as described.Witnesses: I [GEORGE I. SALISBURY.

' DANIEL H. VEADER,

J. N. KIMBALL.

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